This section shows the main steps that have been applied to pre-process the raw data.
The CDOM spectra were modeled according to the information in Babin 2003.
acdom spectra were re-fitted using the complete data (i.e. between 350-500 nm).Average background values calculated between 683-687 nm.
Some files were in binary format, so I could not open them (ex.: C2001000.YSA).
Some spectra start at 300 nm while others at 350 nm.
Calculated the correlation between the measured and the fitted values. Fits with R2 than 0.99 were removed from the data.
Exported the complete spectra (350-700 nm): both the raw and the modeled data.
There were negative values in the irradiance data (Ed, Eu, Kd, Ku). I have cleaned the data by setting these negative values to NA.
DOC, AQY) from Massimo 2000.Just some graphs to visualize the data. Note that the same color palette will be used to represent the areas in all graphics.
Just an overview of the available variables (excluding radiometric measurements).
Overview of the averaged absorption spectra for each area. The acdom spectra have been refitted from the original/raw spectra corrected with the new 746-750 nm background.
Comparing acdom443 for the different areas shows that there is a clear open to coastal gradient.
We can see that the DOC follows the same pattern as acdom443.
We can also use scatterplots to further explore the relationships among variables.
Relationships between some pigments.
There are two stations without geographical coordinates: C2001000, C2002000.
Find a good way to flag the data:
a_phy, a_nap, a_tot spectra contain negative absorption values, but this does not mean they are bad spectra.There are a lot of nutrient parameters that have values of zero. Are they true zero or indicate missing values?
Orientation of the paper
The data is a mix of temporal and spatial observations, so how should we present the data?
area?Eu means that Eu0- was estimated (see with Marcel, I do not remember what it means).
Ed is Ed0- calculated from 0.96 x ed0+.
ed to ed0-.a(715) is always at 0.
There are negative values.